ABSTRACT
With the social development, Geographic Information Systems (GIS) is more and more important in the national economy, used in all aspects of life, such as various types of disaster forecasting, land monitoring, urban planning, facilities management and project construction, etc. It’s also used in the military strategic analysis and have very important position. So a good GIS has a crucial role for a country's development. The GIS is based on the vector data, but also to protect the vector data are potential and accuracy. So a GIS map data in a comprehensive, accurate or not directly affect the overall performance of the GIS.
This paper presents various GIS map type. Analyze the projection method and space Cartesian coordinate system. It focuses on conversion between different coordinates. Conversion of these issues through the analysis and study, that two mosaic map overlay in the course of the various parameters required to achieve the two maps superimposed mosaic.